Edwin m



(No Hndel.)

' E. M. GROSS.

BELTING. V No. 274,280. Patented Mar. 20, 1883.

, I La WITNESSES RH/ENTER" m Fri-ens. hnwumwr. Wnhinglnn. n. c.

UNITED STATE s PATENT OFFICE.

- EDWIN M. cRoss,oF SYRACUSE, NEW YORK.

BELTING.

SPECIFICATION forming part of Iletters Patent No. 274,280, dated March20, 1883.

Application filed February 1, 1883. (No model.)

To all whom it may concern Be it known that I, EDWIN M. GRoss,of

State of New York, have invented new and useful Improvements in Belting,of which the following, taken in connection with the accompanyingdrawings, is a full, clear, and exact description.

It is a well-known fact to mechanical engineers and machinists that theordinary belting at present in the market will, after a short usage,stretch, so as to lose its frictional hold on the pulleys, and requiresfrequent tightening. This defect has in many instances led to theemployment of double belts. These, however, are more expensive, and donot afford a strength proportionate to the quantity ,ofmaterial, owingto the difference in the lengths of the inner and outer layer ofmaterial when stretched on two pulleys, and the consequent unequalstrain on said layers of material.

Manufacturers of belts have attempted to take the stretch out of thebelting by sub jecting it to a stretching-machine; but this treatmenthas only replaced theaforesaid defects by other and more seriousdefeets-viz.,

it frequently weakened the belting by excessi've strain of its fibers,and when suchbelting is applied to use it almost invariably twists andwarps, so as to deprive it of an effective hold on the ing truly.

Attempts have been made to re-enforce single-thick belting by the use ofstrands of wire pulley and of its capacity of trackstretched along thesurface of the belting,

' and fastened thereto at intervals; but it is obvious that suchconstruction does not combine the wire with the belt in such a manner asto impart to the belt the desired stability.

It isto obviate the aforesaid defects by simple andcomparativelyinexpensive means which my invention hasfor its object; andto that end it consists essentially in stitching a single-thick beltlongitudinally with waxed or metallic thread.

In leather belts one row of stitches near each edge thereof, as shown inFigure 1 of in Fig. 2of the drawings.

In Fig. 3 is shown a longitudinal section of the belt, taken on the lineof one of the rows of stitches designated by the reference-letters a a.A leather belt thus made requires no preliminary stretching, but itsfibers are left intact and unimparied, and whether the belt is composedof leather, canvas, rubber, or

the described sewing as to relieve the fibers of the material of thegreater portion of the strain, effectually prevent the stretching of thebelt, and render one edge thereof as strong as the other, thus causingsaid belt to invariably track true and retain its efficiency. In fact,said sewing imparts to the single belt now in use. Furthermore, a singlebeltstitched near the edges in the manner shown and described stifl'ensthe edges thereof, so that when said belt is applied to cone-pulleys theedges of thebelt are capable of resisting the outward or upward pullincident to their fric tional contact with the adjacent vertical face ofthe pulley.

When my improved belting is made of leather, any portion of the hide canbe used. Experience has proved that a belt made from the flank or spongyportion of the hide is as center of the hide.

| nesses of leather and of other material have been sewedlongitudinally; but such sewing was applied merelyfor the purpose ofuniting the unequal distribution of the strain on the several layers orthicknesses of the belt, as before stated, the sewing of such beltingcannot produce .the effect derived when applied to a single thick belt.

FREDERICK H. GIBBs.

I am aware that belts of two or more thick other equivalent material, itis so'reenforced by a strength equal to that of the double belts strongand eflective as one made from the a the several layers of material,and, owing to Having described my invention, whatl claim

